Susana Taveras remembers her son was in pre-K at Success Academy Charter Schools the year she realized that she was going to have to defend his right to be there. That fall, the de Blasio administration insisted that Success Academy sign a 241-page contract dictating how to run pre-K. So, she became a plaintiff in a lawsuit saying that Mayor de Blasio was misinterpreting the law and overstepping his authority to dictate charter school policies and curriculum.